Final answer:
The oldest continuously used bridge in Australia is the Richmond Bridge in Richmond, Tasmania, which was completed in 1825 and is a significant historical landmark.
Step-by-step explanation:
The oldest continuously used bridge in Australia is located in Richmond, Tasmania. The Richmond Bridge is a historic landmark and a testament to Australia's colonial past. This bridge was built by convicts in the early 19th century and was completed in 1825. It is a stone arch bridge that crosses the Coal River and it holds considerable historical significance, making it a popular tourist attraction. The bridge is still in use today, accommodating pedestrian and vehicle traffic and is a vital part of the local infrastructure in Richmond, Tasmania.